001/** 002 * Copyright (c) 2011, The University of Southampton and the individual contributors. 003 * All rights reserved. 004 * 005 * Redistribution and use in source and binary forms, with or without modification, 006 * are permitted provided that the following conditions are met: 007 * 008 * * Redistributions of source code must retain the above copyright notice, 009 * this list of conditions and the following disclaimer. 010 * 011 * * Redistributions in binary form must reproduce the above copyright notice, 012 * this list of conditions and the following disclaimer in the documentation 013 * and/or other materials provided with the distribution. 014 * 015 * * Neither the name of the University of Southampton nor the names of its 016 * contributors may be used to endorse or promote products derived from this 017 * software without specific prior written permission. 018 * 019 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 020 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 021 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 022 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR 023 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 024 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 025 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 026 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 027 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 028 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 029 */ 030package org.openimaj.demos.video.utils; 031 032import org.openimaj.image.Image; 033import org.openimaj.image.processor.SinglebandImageProcessor; 034import org.openimaj.image.renderer.ScanRasteriser; 035import org.openimaj.image.renderer.ScanRasteriser.ScanLineListener; 036import org.openimaj.math.geometry.shape.Polygon; 037import org.openimaj.math.geometry.shape.Rectangle; 038 039/** 040 * Extract a polygon from an image. The output image will just contain the 041 * polygon. The polygon is rasterised using a {@link ScanRasteriser}. 042 * 043 * @author Jonathon Hare (jsh2@ecs.soton.ac.uk) 044 * 045 * @param <T> 046 * The pixel type 047 * @param <S> 048 * The {@link Image} type 049 */ 050public class PolygonExtractionProcessor<T, S extends Image<T, S>> implements SinglebandImageProcessor<T, S> { 051 private Polygon polygon; 052 private T background; 053 054 /** 055 * Construct with the given polygon and background colour 056 * 057 * @param p 058 * @param colour 059 */ 060 public PolygonExtractionProcessor(Polygon p, T colour) { 061 this.polygon = p; 062 this.background = colour; 063 } 064 065 /* 066 * (non-Javadoc) 067 * 068 * @see 069 * org.openimaj.image.processor.ImageProcessor#processImage(org.openimaj 070 * .image.Image) 071 */ 072 @Override 073 public void processImage(final S image) { 074 final Polygon p = this.polygon; 075 final Rectangle r = p.calculateRegularBoundingBox(); 076 077 final int dx = (int) r.x; 078 final int dy = (int) r.y; 079 080 final S output = image.newInstance((int) r.width, (int) r.height); 081 output.fill(background); 082 083 ScanRasteriser.scanFill(p.getVertices(), new ScanLineListener() { 084 @Override 085 public void process(int x1, int x2, int y) { 086 for (int x = x1; x <= x2; x++) { 087 output.setPixel(x - dx, y - dy, image.getPixel(x, y)); 088 } 089 } 090 }); 091 092 image.internalAssign(output); 093 } 094}